Last Modified: Jul 15, 2026
Affected Product(s):
F5OS F5OS-A
Known Affected Versions:
F5OS-A 1.8.0, F5OS-A 1.8.1, F5OS-A 1.8.2, F5OS-A 1.8.3, F5OS-A 1.8.4
Fixed In:
F5OS v2.0.0
Opened: Dec 06, 2024 Severity: 2-Critical
BPDU packets are transmitted on only one LAG member interface even when that interface is down. Traffic does not pass even though everything seems in the correct state.
Traffic is disrupted.
F5OS system configured with Link Aggregation Groups (LAG). LAG interfaces participating in Spanning Tree Protocol (STP/RSTP/MSTP). Multiple physical interfaces configured as LAG members. One or more LAG member interfaces become disabled or go down.
None
Enhanced STP to properly monitor LACP state changes and select active LAG member interfaces for BPDU transmission. System now detects and reacts to LACP state changes in real-time, ensuring BPDU packets are sent on operational LAG member interfaces only.